Chem205_Final_W2008_03-04 - Course: CHEMISTRY Number: 205/4...

Course: CHEMISTRY Number: 205/4 Section: 03 and 04 Instructors: P.H. Bird, C.W. Rogers Examination: Final Date: 14 th April, 2008 Time: 14:00 - 17:00 # of pages: 15 Materials Allowed: A data sheet and periodic table are attached to this paper - no other materials are allowed . You may tear off the data sheet and periodic table if you wish. Calculators Allowed: Yes (But cell phones or electronic dictionaries may NOT be used as calculators.) Special Instructions: This exam contains three sections. Please read the instructions before each section carefully. LAST NAME: ____________________________ FIRST NAME: ____________________________ STUDENT NUMBER: _____________________ SIGNATURE: ____________________________ PLEASE READ THIS PAGE WHILE YOU WAIT TO START.  Check that you have 15 pages including this page. Please write your ID # on all pages.  A periodic table and “useful information” are provided; you CAN remove those pages.   Read ALL questions carefully BEFORE starting the exam, and answer ALL questions.  Write all answers in the space provided (use the backs of the pages for rough work).  SHOW YOUR WORK FOR ALL CALCULATIONS, or you will NOT get full marks. GOOD LUCK! PLEASE RAISE YOUR HAND IF YOU NEED CLARIFICATION. Please leave this area blank

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ID Number ______________________ Chem 205 Winter 2008 Final Exam Sections 03and 04 - page 2 Section I. The following 20 questions are multiple choice. They are worth 2 marks each. You may do rough work on your exam paper, but it will not be marked. You must mark your answers using a soft pencil on the machine readable answer form provided. Do not forget to mark your name and student number (your birth date is not required). 1. All of the following processes are chemical properties of sodium, except: i. It’s freshly cut shiny surface turns black on exposure to air. ii. It is a solid at 25 o C, but changes to a liquid at 98 o C. iii. When a small piece is placed in water, it sizzles, and a gas is formed. iv. When exposed to chlorine gas it forms a compound which melts at 801 o C. v. Its vapour (for example, in streetlights) emits yellow light when an electric current is passed through it. a. (iii) and (iv) b. (i) and (v) c. (ii) and (v) d. (ii), (iv) and (v) e. (iii), (iv) and (v) 2. A student gradually heats some tap water in a beaker in the lab. When the water reaches 30 o C bubbles slowly begin to form on the walls of the beaker and eventually float to the surface. At 100 o C bubbles are forming rapidly throughout the water as it boils. Which of the following statements describes the composition of the bubbles at the lower temperature, and at the boiling point? At 30 o C At 100 o C a. H 2 O (g) H 2 (g) + O 2 (g) b. H 2 O (g) OH – (g) + H + (g) c. Mostly O 2 (g) and N 2 (g) and some H 2 O (g) H 2 O (g) d. H 2 O (g) Mostly O 2 (g) and N 2 (g), and some H 2 O (g) e. CO (g) + O 2 (g) CO 2 (g) 3. An ion of aluminum-26, Al 3+ has: a. 13 protons, 13 neutrons, and 13 electrons b. 13 protons, 10 neutrons, and 26 electrons c. 13 protons, 13 neutrons, and 16 electrons d. 10 protons, 13 neutrons, and 13 electrons e. 13 protons, 13 neutrons, and 10 electrons

ID Number ______________________ Chem 205 Winter 2008 Final Exam Sections 03and 04 - page 3 4. Which pair of elements would be most likely to form an ionic compound with each other?

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